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Finding the Fourth Proportional to 799.85, 1,104.09 and 505.55

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Solution

The fourth proportional to 799.85, 1,104.09 and 505.55 is: 697.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    799.85 : 1,104.09 = 505.55 : x
  2. Step 2: Convert to fraction form
    799.85/1,104.09 = 505.55/x
  3. Step 3: Cross multiply
    799.85x = 1,104.09 × 505.55
  4. Step 4: Simplify right side
    799.85x = 558,172.70
  5. Step 5: Solve for x
    x = 558,172.70/799.85
  6. Step 6: Final answer
    x = 697.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.